What number system is often used in computing and programming?

Correct option is A

Binary System:
Uses only two digits: 0 and 1.
Represents the on/off state of electrical components in computers.
Forms the foundation for all digital data representations.
Other Number Systems:
Hexadecimal uses 16 digits (0-9 and A-F). Because of its small dimensions, it is commonly used to represent memory addresses and color values.
Octal: Consists of 8 digits (0-7). Although less prevalent than hexadecimal, it is nonetheless employed in a few specialized applications.
Decimal refers to the base-10 system that we utilize in everyday life. Used for user input and output in computers, but not for internal functions.
As a result, the binary system is the most fundamental and commonly used number system in computing and programming.